Defending itself in a constitutionality lawsuit initiated by the trainer Jonathan Wong, the Horseracing Integrity and Safety Authority on Friday told a federal judge in Louisiana that the court should either toss out Wong's case entirely or hold off on letting the litigation proceed while the Supreme Court of the United States decides whether it will take on one of three active requests stemming from different cases whose parties all want the nation's highest court to weigh in on similar constitutional issues Wong raises in his lower-court lawsuit. In a...